please help me I have following struct and photos attached. I want to find the duplicate drinks and then delete duplicate and change the original drink quantity by adding one

    var id = UUID()
    var name : String
    var price : Double
    var extra : [DrinkExtra]
    var unit : Int
    var date : Date
} 

I have tried following code but producing error and index out of range and no magic happened.

    func mergeItem(){
     
        for i in cartDrinks.indices.sorted(by: { name1, name2 in
            return cartDrinks[name1].name > cartDrinks[name2].name
        }) {
            if cartDrinks[i].name == cartDrinks[i   1].name {
                cartDrinks[i].unit  = 1
                cartDrinks.remove(at: i   1)
                print("\(cartDrinks[i].name) \(cartDrinks[i].unit)")
            } else {
                print("Nothing found")
            }
        }
        
    }

many thanks in advance

CodePudding user response：

Finally I have following code to complete my desired task. many thanks

    func mergeItem(complete:() -> Void) {
        
        var arr = cartDrinks
        var alacartarr = cartexpress
        arr.enumerated().forEach { index,item in
            if let existIndex = arr.firstIndex(where: {item.name == $0.name }),
               existIndex != index {
                arr[existIndex].unit  = arr[index].unit
                arr[index].unit = 0
        }
    }
        arr.removeAll(){$0.unit == 0}
        self.cartDrinks.removeAll()
        self.cartDrinks.append(contentsOf: arr)
        
        alacartarr.enumerated().forEach { index,value in
            if let existedIndex = alacartarr.firstIndex(where: {value.name == $0.name}),
               existedIndex != index {
                alacartarr[existedIndex].quantity  = alacartarr[index].quantity
                alacartarr[index].quantity = 0
            }
        }
        alacartarr.removeAll(){$0.quantity == 0}
        cartexpress.removeAll()
        cartexpress.append(contentsOf: alacartarr)
        
        complete()
    }